Y-△ decompression starting control circuit

Close the power switch Qs, press the start button SB2, KM1 is energized and self-locking, KM3 is energized, the main contact of KM3 is closed, the motor is connected
in Y connection, and connected to the three-phase power supply for decompression starting. At the same time, the time relay KT is energized and Start timing, after a period of delay, the
delayed moving contact of KT is disconnected, KM3 is released when power is turned off, and the Y neutral point of the motor is disconnected. At the same time, the delayed moving contact of KT is closed, KM2 is energized and
automatically Lock, the motor is connected to operate in △ connection, and KM2 is used to disconnect the coil of KT. In addition, the auxiliary contacts KMZ and KM3 are interlocking contacts to
prevent KM3 and KM2 from being charged at the same time. At this point, the Y-△ decompression starting process of the motor is completed, and the motor is put into normal operation (at rated voltage)
. When parking, just press SB1.